├── .DS_Store
├── .gitattributes
└── ESP32-MQTT.ino


/.DS_Store:
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https://raw.githubusercontent.com/techiesms/ESP32-MQTT/0be4a40f0f28c6883e419f45889c204a526775aa/.DS_Store


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/.gitattributes:
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1 | # Auto detect text files and perform LF normalization
2 | * text=auto
3 | 


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/ESP32-MQTT.ino:
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  1 | //This code is edited by Sachin Soni(techiesms) for a project tutorital on
  2 | //Controlling Appliances and monitoring sensor's data over Internet using Ubidots MQTT server
  3 | //The video is uploaded on youtube whose link is :- https://youtu.be/LvzCeBce2mU
  4 | 
  5 | /****************************************
  6 |  * Include Libraries
  7 |  ****************************************/
  8 | #include <WiFi.h>
  9 | #include <PubSubClient.h>
 10 | 
 11 | #define WIFISSID "SSID" // Put your WifiSSID here
 12 | #define PASSWORD "PASS" // Put your wifi password here
 13 | #define TOKEN "TOKEN" // Put your Ubidots' TOKEN
 14 | #define MQTT_CLIENT_NAME "RandomName" // MQTT client Name, please enter your own 8-12 alphanumeric character ASCII string; 
 15 |                                            //it should be a random and unique ascii string and different from all other devices
 16 | 
 17 | /****************************************
 18 |  * Define Constants
 19 |  ****************************************/
 20 | #define VARIABLE_LABEL "hall-sensor" // Assing the variable label
 21 | #define VARIABLE_LABEL_SUBSCRIBE "relay" // Assing the variable label
 22 | #define DEVICE_LABEL "esp32" // Assig the device label
 23 | 
 24 | #define relay 26 // Set the GPIO26 as RELAY
 25 | 
 26 | char mqttBroker[]  = "things.ubidots.com";
 27 | char payload[100];
 28 | char topic[150];
 29 | char topicSubscribe[100];
 30 | // Space to store values to send
 31 | char str_sensor[10];
 32 | 
 33 | /****************************************
 34 |  * Auxiliar Functions
 35 |  ****************************************/
 36 | WiFiClient ubidots;
 37 | PubSubClient client(ubidots);
 38 | 
 39 | 
 40 | 
 41 | void reconnect() {
 42 |   // Loop until we're reconnected
 43 |   while (!client.connected()) {
 44 |     Serial.println("Attempting MQTT connection...");
 45 |     
 46 |     // Attemp to connect
 47 |     if (client.connect(MQTT_CLIENT_NAME, TOKEN, "")) {
 48 |       Serial.println("Connected");
 49 |       client.subscribe(topicSubscribe);
 50 |     } else {
 51 |       Serial.print("Failed, rc=");
 52 |       Serial.print(client.state());
 53 |       Serial.println(" try again in 2 seconds");
 54 |       // Wait 2 seconds before retrying
 55 |       delay(2000);
 56 |     }
 57 |   }
 58 | }
 59 | void callback(char* topic, byte* payload, unsigned int length) {
 60 |   char p[length + 1];
 61 |   memcpy(p, payload, length);
 62 |   p[length] = NULL;
 63 |   String message(p);
 64 |   if (message == "0") {
 65 |     digitalWrite(relay, LOW);
 66 |   } else {
 67 |     digitalWrite(relay, HIGH);
 68 |   }
 69 |   
 70 |   Serial.write(payload, length);
 71 |   Serial.println();
 72 | }
 73 | 
 74 | /****************************************
 75 |  * Main Functions
 76 |  ****************************************/
 77 | void setup() {
 78 |   Serial.begin(115200);
 79 |   WiFi.begin(WIFISSID, PASSWORD);
 80 |   // Assign the pin as INPUT 
 81 |   pinMode(relay, OUTPUT);
 82 | 
 83 |   Serial.println();
 84 |   Serial.print("Wait for WiFi...");
 85 |   
 86 |   while (WiFi.status() != WL_CONNECTED) {
 87 |     Serial.print(".");
 88 |     delay(500);
 89 |   }
 90 |   
 91 |   Serial.println("");
 92 |   Serial.println("WiFi Connected");
 93 |   Serial.println("IP address: ");
 94 |   Serial.println(WiFi.localIP());
 95 |   client.setServer(mqttBroker, 1883);
 96 |   client.setCallback(callback);
 97 | 
 98 |   sprintf(topicSubscribe, "/v1.6/devices/%s/%s/lv", DEVICE_LABEL, VARIABLE_LABEL_SUBSCRIBE);
 99 |   
100 |   client.subscribe(topicSubscribe);
101 | }
102 | 
103 | void loop() {
104 |   if (!client.connected()) {
105 |     client.subscribe(topicSubscribe);   
106 |     reconnect();
107 |   }
108 | 
109 |   sprintf(topic, "%s%s", "/v1.6/devices/", DEVICE_LABEL);
110 |   sprintf(payload, "%s", ""); // Cleans the payload
111 |   sprintf(payload, "{\"%s\":", VARIABLE_LABEL); // Adds the variable label
112 |   
113 |   float sensor = hallRead();
114 |   Serial.print("Value of Sensor is:- ");Serial.println(sensor);
115 |   
116 |   /* 4 is mininum width, 2 is precision; float value is copied onto str_sensor*/
117 |   dtostrf(sensor, 4, 2, str_sensor);
118 |   
119 |   sprintf(payload, "%s {\"value\": %s}}", payload, str_sensor); // Adds the value
120 |   Serial.println("Publishing data to Ubidots Cloud");
121 |   client.publish(topic, payload);
122 |   client.loop();
123 |   delay(1000);
124 | }
125 | 


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